I am making a troll map  . Like different kinds of things to mess with the players. Like doors opening nothing, or doors opening traps.
Soo my questions is, how do I make a floor seem like its there, but its actually not, soo you fall trough it.
I saw it in CoD2 custom maps, like in deathrun. Where you step on something, and you fall trough and die.
Soo please help

Go in Radiant, select the brush you want to make non-solid, Right Mouse button on the brush in the 2D view and click Make Non-colliding:


Hope that helps. Don't forget to recompile your map + mod

Lukkie1998